P0128 - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 22 (permalink) Old 11-19-2013, 04:50 PM Thread Starter
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P0128

Tonight I was driving my 05 balt base coupe at 65MPH with the outside temperature being 33oF and coolant temperature changing between 167oF-180oF. My check engine light came on and gave P0128 code about the coolant temperature sensor. I have cleared it and drove 6 more miles and it hasnt come back. What could be the cause for this?
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post #2 of 22 (permalink) Old 11-19-2013, 05:11 PM
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Bad ground. Mine does it all the time. I just delete it and move on. Its a bitch to start when the code is on though, I'd suggest pulling your fan relays prior to attempting to start when you don't have access to a code reader

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post #3 of 22 (permalink) Old 11-19-2013, 05:47 PM
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Chances are if you've never changed the thermostat that the rubber seal that runs around the opening has started to deteriorate to the point that coolant flows by and the thermostat can't bring or keep your engine at proper operating temperature which should be around 193F.

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post #4 of 22 (permalink) Old 11-19-2013, 06:52 PM Thread Starter
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So it sounds like I need to replace my thermostat. Ugh I just flushed my coolant like two months ago too. Is there a "How-to"?
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post #5 of 22 (permalink) Old 11-19-2013, 07:51 PM
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I replaced my thermostat and it does it all the time. Dont give up hope on something simple. Delete the code and see if or when it comes back

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post #6 of 22 (permalink) Old 11-20-2013, 05:35 AM
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Turn on your car. Blast the hot air. Squeeze the rad hose that goes the the block. Cleared the code and hasn't come back since


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post #7 of 22 (permalink) Old 11-20-2013, 12:33 PM Thread Starter
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The light came back on while driving like before


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2005 Chevrolet Cobalt 2.2L Base Coupe Automatic
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post #8 of 22 (permalink) Old 11-20-2013, 01:12 PM
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Quote:
Originally Posted by 06slobalt View Post
Turn on your car. Blast the hot air. Squeeze the rad hose that goes the the block. Cleared the code and hasn't come back since


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post #9 of 22 (permalink) Old 11-20-2013, 06:00 PM Thread Starter
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is there a how-to? Where exactly is the thermostat located on a 2.2L Base? Photos?

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post #10 of 22 (permalink) Old 11-20-2013, 06:35 PM
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Its right above the transmission on the top rear where the bellhousing and motor mate up

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